PartsTable
Technical Data Sheet

332/U1664 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

332/U1664: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include width: 2.50 MILLIMETERS NOMINAL MM, material: STEEL OVERALL, hole_diameter: 17.0 MILLIMETERS NOMINAL MM, overall_diameter: 28.0 MILLIMETERS NOMINAL MM, special_features: M16, SMALL O/D, BS970, GRADE 050A10, surface_treatment: ZINC OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-668-5512, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
332/U1664
NSN: 5310-01-668-5512
FSC: 5310 — Nuts and Washers
CAGE: 0JKF0 — JCB INC. (USA)
SPECIFICATIONS
width2.50 MILLIMETERS NOMINAL MM
materialSTEEL OVERALL
hole_diameter17.0 MILLIMETERS NOMINAL MM
overall_diameter28.0 MILLIMETERS NOMINAL MM
special_featuresM16, SMALL O/D, BS970, GRADE 050A10
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
part_name_assigned_by_controlling_agencyWASHER, FLAT
NSN5310-01-668-5512
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 332/U1664 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OVERALL DIAMETER: 28.0 MILLIMETERS NOMINAL MM
•
SURFACE TREATMENT: ZINC OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
WIDTH: 2.50 MILLIMETERS NOMINAL MM
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER28.0 MILLIMETERS NOMINAL MM
SPECIAL FEATURESM16, SMALL O/D, BS970, GRADE 050A10
SURFACE TREATMENTZINC OVERALL
PERIPHERAL SHAPE STYLEROUND
WIDTH2.50 MILLIMETERS NOMINAL MM
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER, FLAT
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER17.0 MILLIMETERS NOMINAL MM
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 332/U1664?
332/U1664 is a WASHER,FLAT.
What is the NSN for 332/U1664?
332/U1664 is cataloged in the U.S. Government catalog under NSN 5310-01-668-5512. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.